In some cases, I have had frags that took weeks to finely colour up and get good PE. Try placing it in several locations, might not like the spot it's in. Flow might have some factors as well, I have noticed better polyp extension after I bumped my flow to around 10000 gph, and my tank dimensions are 45" x 30" x 24" high.
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There's plenty of room for all God's creatures.
Right next to the mashed potatoes.
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